189878810529 has 4 divisors (see below), whose sum is σ = 253171747376. Its totient is φ = 126585873684.

The previous prime is 189878810507. The next prime is 189878810543. The reversal of 189878810529 is 925018878981.

189878810529 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 189878810529 - 2⁸ = 189878810273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189878810529.

It is not an unprimeable number, because it can be changed into a prime (189878817529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31646468419 + ... + 31646468424.

It is an arithmetic number, because the mean of its divisors is an integer number (63292936844).

Almost surely, 2^189878810529 is an apocalyptic number.

It is an amenable number.

189878810529 is a deficient number, since it is larger than the sum of its proper divisors (63292936847).

189878810529 is an equidigital number, since it uses as much as digits as its factorization.

189878810529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63292936846.

The product of its (nonzero) digits is 23224320, while the sum is 66.

The spelling of 189878810529 in words is "one hundred eighty-nine billion, eight hundred seventy-eight million, eight hundred ten thousand, five hundred twenty-nine".